AIIMS 2019 Chemistry Molecular Orbital Theory Assertion Reason Question
Assertion: H₂⁺ and ions have the same bond order. Reason: H₂⁺ is less stable than H₂⁻.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The assertion that H₂⁺ and H₂⁻ have the same bond order is true because both species have a bond order of 0.5, calculated from their molecular orbital configurations. However, the reason that H₂⁺ is less stable than H₂⁻ is false; in fact, H₂⁺ is less stable than H₂ due to its positive charge and lower electron count, while H₂⁻ is more stable than H₂ due to the extra electron. Options A and B are incorrect because they imply that the reason correctly explains the assertion, which it does not, and option D is incorrect as the assertion is true.
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